GALLAGHER THOMAS JOSEPH (President) reported 6 transactions at ARTHUR J. GALLAGHER & CO.

Review the transaction codes below to understand the nature of each event.

GALLAGHER THOMAS JOSEPH

Filed: 3/24/2026ACC: 0000354190-26-000108

InsiderGALLAGHER THOMAS JOSEPHCIK 1589933

→

IssuerARTHUR J. GALLAGHER & CO.CIK 354190

Officer· President

Since Mar 2026

-704.00

Net shares

Net seller

$0.00

Total acquired

Open market trades

0B · 0S

Total transactions

528.00 acquired · 1.23K disposed

Non-Derivative Transactions6

Common Stock

Direct

G · Gift

−264.00

Price / share

—

Trade value

—

% of position

0.1%

3/23/2026

324.18K→323.92K

Common Stock

Indirect

G · Gift

+264.00

Price / share

—

Trade value

—

% of position

0.2%

3/23/2026

119.17K→119.44K

Common Stock

Direct

G · Gift

−528.00

Price / share

—

Trade value

—

% of position

0.2%

3/23/2026

323.92K→323.39K

Common Stock

Indirect

G · Gift

−264.00

Price / share

—

Trade value

—

% of position

0.8%

3/23/2026

32.43K→32.16K

Common Stock

Indirect

G · Gift

+264.00

Price / share

—

Trade value

—

% of position

0.2%

3/23/2026

119.44K→119.70K

Common Stock

Indirect

G · Gift

−176.00

Price / share

—

Trade value

—

% of position

0.5%

3/23/2026

32.16K→31.99K

Total

Net shares

−704.00

Net value

$0.00

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	3/23/2026	G · Gift	−264.00	—	—	0.1%	324.18K	323.92K
Common Stock Indirect	3/23/2026	G · Gift	+264.00	—	—	0.2%	119.17K	119.44K
Common Stock Direct	3/23/2026	G · Gift	−528.00	—	—	0.2%	323.92K	323.39K
Common Stock Indirect	3/23/2026	G · Gift	−264.00	—	—	0.8%	32.43K	32.16K
Common Stock Indirect	3/23/2026	G · Gift	+264.00	—	—	0.2%	119.44K	119.70K
Common Stock Indirect	3/23/2026	G · Gift	−176.00	—	—	0.5%	32.16K	31.99K
Total			−704.00		$0.00

Derivative Transactions0

No derivative transactions reported

Non-Derivative Holdings (Post-Transaction)3

Common Stock

Indirect

Shares owned62.30K

Common Stock

Indirect

Shares owned96.71K

Common Stock

Indirect

Shares owned491.14

Total

159.50K indirect159.50K

Security Title	Shares Owned	Ownership Type
Common Stock	62.30K	Indirect
Common Stock	96.71K	Indirect
Common Stock	491.14	Indirect
Total	159.50K	159.50K indirect

Derivative Holdings (Post-Transaction)9

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

22.22K

Shares owned

22.22K

Exercise price

228.20

Expiration

—

Exercise window

—

Notional Stock Units

Direct

Underlying security

Common Stock

Underlying shares

11.45K

Shares owned

11.45K

Exercise price

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

31.34K

Shares owned

31.34K

Exercise price

86.17

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

12.74K

Shares owned

12.74K

Exercise price

177.09

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

32.90K

Shares owned

32.90K

Exercise price

127.90

Expiration

—

Exercise window

—

Phantom Stock

Direct

Underlying security

Common Stock

Underlying shares

20.29K

Shares owned

20.29K

Exercise price

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

14.88K

Shares owned

14.88K

Exercise price

337.74

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

15.07K

Shares owned

15.07K

Exercise price

243.54

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

15.31K

Shares owned

15.31K

Exercise price

158.56

Expiration

—

Exercise window

—

Total

Underlying

176.19K

Owned

176.19K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Non-qualified Stock Option Direct	Common Stock	228.20	—	—	22.22K	22.22K
Notional Stock Units Direct	Common Stock	0	—	—	11.45K	11.45K
Non-qualified Stock Option Direct	Common Stock	86.17	—	—	31.34K	31.34K
Non-qualified Stock Option Direct	Common Stock	177.09	—	—	12.74K	12.74K
Non-qualified Stock Option Direct	Common Stock	127.90	—	—	32.90K	32.90K
Phantom Stock Direct	Common Stock		—	—	20.29K	20.29K
Non-qualified Stock Option Direct	Common Stock	337.74	—	—	14.88K	14.88K
Non-qualified Stock Option Direct	Common Stock	243.54	—	—	15.07K	15.07K
Non-qualified Stock Option Direct	Common Stock	158.56	—	—	15.31K	15.31K
Total					176.19K	176.19K